The following information is from the Adventure Time comic book series. It may not be part of the same canon or continuity as the animated series.
Ice King "Do you know what Ice King means?!"
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The time machine is a time-travel device created by Princess Bubblegum. The only problem about the device, is that it can take anyone pressing the button, and whoever touches that person, is sent back to the moment when Princess Bubblegum created it—and that moment "only." Princess Bubblegum also designed it so that the people traveling through time replaces their previous selves.


The time machine is shown as a medium sized, red-orange cylinder. On one side is a small red button to activate it. One the other side is two tube-like silver wires. In the middle is a gray display for four digits. There is also a hidden counter that tells the number of times the time machine has been used.